After Governor William Hobson was sidelined by a stroke, Colonial Secretary Willoughby Shortland stepped in and sent the Treaty of Waitangi south, in the hope of finding more signatures. The fourth episode of Mike King’s Treaty discovery series sets out to find where the sheet was signed on the Manukau Harbour. King learns of an unfulfilled prophecy, and why Ngāti Whātua chief Āpihai Te Kawau agreed to sign. Then King crosses the harbour and uses his mission as an excuse to visit another food festival — in Kāwhia, where he learns about the chiefs who saw trade opportunities in the incoming "great white wave".